Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh di » thanh doi, thanh de, thanh do
te sach » toc sach
sach ky » sac ky, sach y, sach ty
duc van » duc va, duc tan, duc manh
hoc duc » hoc duoc, hoc nuoc, hoc thuc
cua tuc » cua duc, cua thuoc, luat tuc
hieu va » lieu va, hieu qua
ma hoi » mai hoi, ma hoa, me hoi
cua tu » cua su, cua cu, cua te
va hoc » van hoc

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((ma hoi) OR (xa hoi)). hieu va hoc duc van thanh di ((cua tu) OR (cua tuc))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((ma hoi) or (xa hoi)). hieu va hoc duc van thanh di ((cua tu) OR (cua tuc))~".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((ma hoi) or (xa hoi)). hieu va hoc duc van thanh di ((cua tu) OR (cua tuc))*.